In Ted Davis's definition of YEC,>(2) All major "kinds" (often these are called "baramin,">combining the Hebrew words for create and kind) of plants and animals were>created separately, in 6 literal days; considerable change has taken place>since the creation week, however, within these created kinds.

is not accepted by all YEC's. Some do not accept the presence of any
significant change within these kinds, and define kinds at a much lower
level (e.g., separately created kind=species rather than separately created
kind=family).